download stationary header calculation stationary header design https://3d-labs.com/product/stationary-header-calculation/ In stationary header calculation the design temperature is 260 deg.C, the design pressure is 8kg/cm2 ,corrosion allowance is 1.5mm , material of header plate is SA516 Gr.60,the allowable stress is 1054 kg/cm2,the material of gasket is IJA.